Need Help!- Controller Schematic... First Attempt

[Senna]

I'm at the point in my build (http://www.cnczone.com/forums/showthread.php?t=65393) where the mechanical side of the construction is almost complete and now the electronic side begins. I'm totally lacking in the skills or language of electronics but I have scoured these forums in an attempt to educate myself and move my project along.

Would one of the electronic gurus here please look over my first attempt at a wiring schematic using HobbyCNC 23-305-DS8A steppers, AnTek power supply, Gecko 251's and a CNC4PC C10 break out board.

I would very much appreciate any comments or suggestions to make this assemblage of components a success.

Senna

[bharbour]

It looks workable to me. I did not check the motor wiring. You might consider a fuse or circuit breaker on the 50V DC power supply output to reduce drama/destruction in case of a slip with a screwdriver or a stray piece of swarf.

Good Luck,
BobH

[Bubba]

I notice "daisy chaining" of the output of the power supply to your first junction block. I understand you should run separate wires directly from the power supply to the appropriate point on the block.
Also, Mariss has repeatedly indicated that DC power switching is not a good practice and that includes fuses in this area. Put a fuse on the AC side and let it go at that.

[Senna]

Thanks for the suggestions... it's also been pointed out that the stepper wiring has the coils shorted. I'll need to investigate and modify.

Senna

[Senna]

Due to a major oversight on my part it's been pointed out that the Gecko G251 drivers will not operate in a unipolar configuration which is how I have the schematic drawn. The HobbyCNC 23-305-DS8A steppers are 425oz/in 4.2A when wired in bipolar parallel so they would exceed the amp rating of the G251's which are 3.5A max. So... I'm told I will need to employ current limiting resistors of 3.48K to keep the Gecko's happy and that I will suffer a slight loss of torque.

Here's the revised schematic showing the bipolar parallel config...

Senna